/* 
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System;

namespace Lucene.Net.Index
{
	
	/// <summary>A {@link MergeScheduler} that simply does each merge
	/// sequentially, using the current thread. 
	/// </summary>
	public class SerialMergeScheduler:MergeScheduler
	{
		
		/// <summary>Just do the merges in sequence. We do this
		/// "synchronized" so that even if the application is using
		/// multiple threads, only one merge may run at a time. 
		/// </summary>
		public override void  Merge(IndexWriter writer)
		{
			lock (this)
			{
				
				while (true)
				{
					MergePolicy.OneMerge merge = writer.GetNextMerge();
					if (merge == null)
						break;
					writer.Merge(merge);
				}
			}
		}
		
		public override void  Close()
		{
		}
	}
}